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bug#26553: Possible touch bug

From: De Fabrizio Franco
Subject: bug#26553: Possible touch bug
Date: Tue, 18 Apr 2017 15:10:26 +0000

Hi all,

the following touch behavior (maybe a bug) was noticed on the following 

$uname -a
Linux lnx3469.eng.zkb.ch 2.6.32-642.13.2.el6.x86_64 #1 SMP Sat Feb 18 16:54:58 
EST 2017 x86_64 x86_64 x86_64 GNU/Linux

$df -k .
Filesystem     1K-blocks  Used Available Use% Mounted on
none            16436080   236  16435844   1% /tmp

$mount -v | grep /tmp
none on /tmp type tmpfs (rw,nosuid)

$date +%s.%N ; touch file ; sync ; stat file ; date +%s.%N ; rm file
  File: `file'
  Size: 0               Blocks: 0          IO Block: 4096   regular empty file
Device: 12h/18d Inode: 109880010   Links: 1
Access: (0644/-rw-r--r--)  Uid: ( 7315/    t315)   Gid: (  100/   users)
Access: 2017-04-18 17:00:31.905896730 +0200
Modify: 2017-04-18 17:00:31.905896730 +0200
Change: 2017-04-18 17:00:31.905896730 +0200

Even the touch command was executed after the date command, the output shows 
that the file is older...
I've tested the behaviour is in a loop and had a 35% percentile of this faulty 
behaviour. Also occurs on a ext4 filesystem as well.

With kind regards,

Franco De Fabrizio



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